"""一个可用于表示汽车的类"""
class Car:
	"""一次模拟汽车的简单尝试"""			# 模块级文档字符串，对该模块的内容做了简要的描述。
										# 应为自己创建的每个模块编写文档字符串。

	def __init__(self, make, model, year):
		"""初始化描述汽车的属性"""
		self.make = make
		self.model = model
		self.year = year
		self.odometer_reading = 0

	def get_descriptive_name(self):
		"""返回整洁的描述性名称"""
		long_name = f"{self.year} {self.make} {self.model}"
		return long_name.title()

	def read_odometer(self):
		"""打印一条消息，指出汽车的里程"""
		print(f"This car has {self.odometer_reading} miles on it.")

	def update_odometer(self, mileage):
		"""
		将里程表读书设置为指定的值
		拒绝将里程表往回调
		"""
		if mileage >= self.odometer_reading:
			self.odometer_reading = mileage
		else:
			print("You can't roll back an odometer!")

	def increment_odometer(self, miles):
	 	"""将里程表读数增加指定的量"""
	 	self.odometer_reading += miles

class Battery:
	"""一次模拟电动汽车电瓶的简单尝试。"""
	
	def __init__(self, battery_size=75):
		"""初始化电瓶的属性。"""
		self.battery_size = battery_size
	
	def describe_battery(self):
		"""打印一条描述电瓶容量的消息。"""
		print(f"This car has a {self.battery_size}-kWh battery.")

	def get_range(self):
		"""打印一条描述电瓶续航里程的消息。"""
		if self.battery_size == 75:
			range = 260
		elif self.battery_size == 100:
			range = 315
		print(f"This car can go about {range} miles on a full charge.")

class ElectricCar(Car):
	"""模拟电动汽车的独特之处。"""
	def __init__(self, make, model, year):
		"""
		初始化父类的属性。
		再初始化电动汽车特有的属性。
		"""
		super().__init__(make, model, year)
		self.battery = Battery()
	 